Onychocryptosis

Onychophosis

Subungal hematoma

damage to the nail plate (damage to nail bed, that you can see through the nail plate)
Fills potential space with hematoma (hemorrhage) (can squirt out)
Associated with simple and complex nail bed lacerations, open phalanx fractures
Should be drained if >25% of the visible nail plate or if nail plate is visibly unstable